[jdk21u] Integrated: 8315554: C1: Replace "cmp reg, 0" with "test reg, reg" on x86

[Aleksey Shipilev]

On Mon, 13 Nov 2023 19:22:46 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Clean backport to improve generated code density.
> 
> Additional testing:
>  - [x] Linux x86_64 fastdebug, `tier1 tier2 tier3 tier4`, `-XX:TieredStopAtLevel=1`

This pull request has now been integrated.

Changeset: 44bb402e
Author:    Aleksey Shipilev <shade at openjdk.org>
URL:       https://git.openjdk.org/jdk21u/commit/44bb402e350a3e5eeb5db1921bbae1b6b18f3453
Stats:     15 lines in 1 file changed: 5 ins; 0 del; 10 mod

8315554: C1: Replace "cmp reg, 0" with "test reg, reg" on x86

Backport-of: bd477810b176696e0fd043f5594663ebcf9884cf

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PR: https://git.openjdk.org/jdk21u/pull/355